Effect of epithelial debridement on human cornea proteoglycans

Transcription

1 Brazilian Human corneal Journal explant of Medical proteoglycans and Biological Research (2001) 34: ISSN X Short Communication 325 Effect of epithelial debridement on human cornea proteoglycans E.S. Soriano 1, M.S.Q. Campos 2, J.A.K. Aguiar 1 and Y.M. Michelacci 1 Departamentos de 1 Bioquímica and 2 Oftalmologia, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, SP, Brasil Correspondence Y.M. Michelacci Disciplina de Biologia Molecular Departamento de Bioquímica EPM, UNIFESP Rua Três de Maio, São Paulo, SP Brasil Fax: yara.bioq@epm.br Presented at the 6th Brazilian Symposium on Extracellular Matrix - SIMEC, Angra dos Reis, RJ, Brazil, September 24-27, Research supported by CNPq, CAPES and FAPESP. Received October 19, 2000 Accepted February 5, 2001 Abstract Key words Corneal explants De-epithelization Glycosaminoglycan Proteoglycan

2 326 E.S. Soriano et al.

3 Human corneal explant proteoglycans 327

4 328 E.S. Soriano et al. B PG Immunoblot ì í î Toluidine blue Radioautogram Anti-KS Anti-decorin A PG PG M PG PG M M PG PG M PG PG GAG PG PG + M papain GAG GAG M GAG GAG M M GAG GAG M GAG GAG Figure 1 - Agarose gel electrophoresis of proteoglycans and glycosaminoglycans extracted from human corneas. Aliquots (5 µl) of papain-digested proteoglycans (panel A), or intact proteoglycans (PG) and glycosaminoglycans (GAG) (panel B) extracted from human corneas were submitted to agarose gel electrophoresis in 0.05 M 1,3-diaminopropane acetate buffer, ph 9.0, at 5 V/cm for 1 h. The proteoglycans and glycosaminoglycans were fixed in the gel by 0.1% cetyltrimethylammonium bromide and stained with toluidine blue, as previously described (15). The 35 S-labeled compounds were observed by radioautography. Decorin (a dermatan sulfate proteoglycan) and keratan sulfate were also identified by immunoblotting stained with an anti-decorin polyclonal antibody and MST1 (an anti-keratan sulfate monoclonal antibody). M: Mixture of standard glycosaminoglycans containing chondroitin sulfate (), dermatan sulfate (), keratan sulfate (KS), and heparan sulfate ().

5 Human corneal explant proteoglycans 329 A GAG (mg/g tissue wet weight) B S-GAG (cpm/g tissue wet weight)12000 Control Partial de-epithelization (mg/g tissue wet weight) (mg/g tissue wet weight) Total de-epithelization (mg/g tissue wet weight) KS Control (cpm/g tissue wet weight) Partial de-epithelization (cpm/g tissue wet weight) Total de-epithelization (cpm/g tissue wet weight) KS Figure 2 - Total glycosaminoglycans (A) and 35 S-labeled glycosaminoglycans (B) extracted from explants of intact or epithelium-debrided human corneas. Total glycosaminoglycans were stained with toluidine blue and quantified by densitometry. The 35 S-glycosaminoglycans were visualized by radioautography and scraped off the gels, and radioactivity was measured with a liquid scintillation spectrophotometer. Data are reported as means ± SD of 14 experiments. GAG, Total glycosaminoglycan;, dermatan sulfate; KS, keratan sulfate;, heparan sulfate.

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